Stephen Hemminger wrote:
On Wed, 15 Mar 2006 20:13:01 -0800
Skunk Worx <[EMAIL PROTECTED]> wrote:
Hello,
I've taken a performance hit over localhost between kernels 2.6.14 and
2.6.15 in my client/server application.
This came up with java debugging already. The problem is when the sender
writes a message in separate write() system calls, each one becomes
a separate packet. In 2.6.15 we do a new thing called Appropriate Byte
Count and that penalizes stupid applications, but provides better fairness
over the internet by accounting for packets better.
I am curious about why this is seen only on loopback. Over ether, with
client and server on two machines, there is no 40ms. ack penalty. If
anything, I would expect to see things the other way around--penalty on
ether, no penalty on loopback.
---
John
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